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934 lines
28 KiB
Python
934 lines
28 KiB
Python
import re
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from mako.pygen import PythonPrinter
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from sqlalchemy import schema as sa_schema
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from sqlalchemy import sql
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from sqlalchemy import types as sqltypes
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from .. import util
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from ..operations import ops
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from ..util import compat
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from ..util import sqla_compat
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from ..util.compat import string_types
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from ..util.compat import StringIO
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MAX_PYTHON_ARGS = 255
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try:
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from sqlalchemy.sql.naming import conv
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def _render_gen_name(autogen_context, name):
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if isinstance(name, conv):
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return _f_name(_alembic_autogenerate_prefix(autogen_context), name)
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else:
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return name
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except ImportError:
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def _render_gen_name(autogen_context, name):
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return name
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def _indent(text):
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text = re.compile(r"^", re.M).sub(" ", text).strip()
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text = re.compile(r" +$", re.M).sub("", text)
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return text
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def _render_python_into_templatevars(
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autogen_context, migration_script, template_args
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):
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imports = autogen_context.imports
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for upgrade_ops, downgrade_ops in zip(
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migration_script.upgrade_ops_list, migration_script.downgrade_ops_list
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):
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template_args[upgrade_ops.upgrade_token] = _indent(
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_render_cmd_body(upgrade_ops, autogen_context)
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)
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template_args[downgrade_ops.downgrade_token] = _indent(
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_render_cmd_body(downgrade_ops, autogen_context)
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)
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template_args["imports"] = "\n".join(sorted(imports))
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default_renderers = renderers = util.Dispatcher()
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def _render_cmd_body(op_container, autogen_context):
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buf = StringIO()
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printer = PythonPrinter(buf)
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printer.writeline(
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"# ### commands auto generated by Alembic - please adjust! ###"
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)
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has_lines = False
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for op in op_container.ops:
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lines = render_op(autogen_context, op)
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has_lines = has_lines or lines
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for line in lines:
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printer.writeline(line)
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if not has_lines:
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printer.writeline("pass")
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printer.writeline("# ### end Alembic commands ###")
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return buf.getvalue()
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def render_op(autogen_context, op):
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renderer = renderers.dispatch(op)
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lines = util.to_list(renderer(autogen_context, op))
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return lines
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def render_op_text(autogen_context, op):
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return "\n".join(render_op(autogen_context, op))
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@renderers.dispatch_for(ops.ModifyTableOps)
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def _render_modify_table(autogen_context, op):
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opts = autogen_context.opts
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render_as_batch = opts.get("render_as_batch", False)
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if op.ops:
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lines = []
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if render_as_batch:
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with autogen_context._within_batch():
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lines.append(
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"with op.batch_alter_table(%r, schema=%r) as batch_op:"
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% (op.table_name, op.schema)
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)
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for t_op in op.ops:
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t_lines = render_op(autogen_context, t_op)
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lines.extend(t_lines)
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lines.append("")
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else:
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for t_op in op.ops:
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t_lines = render_op(autogen_context, t_op)
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lines.extend(t_lines)
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return lines
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else:
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return []
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@renderers.dispatch_for(ops.CreateTableCommentOp)
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def _render_create_table_comment(autogen_context, op):
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templ = (
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"{prefix}create_table_comment(\n"
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"{indent}'{tname}',\n"
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"{indent}{comment},\n"
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"{indent}existing_comment={existing},\n"
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"{indent}schema={schema}\n"
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")"
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)
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return templ.format(
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prefix=_alembic_autogenerate_prefix(autogen_context),
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tname=op.table_name,
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comment="%r" % op.comment if op.comment is not None else None,
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existing="%r" % op.existing_comment
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if op.existing_comment is not None
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else None,
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schema="'%s'" % op.schema if op.schema is not None else None,
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indent=" ",
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)
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@renderers.dispatch_for(ops.DropTableCommentOp)
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def _render_drop_table_comment(autogen_context, op):
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templ = (
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"{prefix}drop_table_comment(\n"
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"{indent}'{tname}',\n"
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"{indent}existing_comment={existing},\n"
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"{indent}schema={schema}\n"
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")"
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)
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return templ.format(
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prefix=_alembic_autogenerate_prefix(autogen_context),
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tname=op.table_name,
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existing="%r" % op.existing_comment
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if op.existing_comment is not None
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else None,
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schema="'%s'" % op.schema if op.schema is not None else None,
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indent=" ",
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)
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@renderers.dispatch_for(ops.CreateTableOp)
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def _add_table(autogen_context, op):
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table = op.to_table()
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args = [
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col
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for col in [
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_render_column(col, autogen_context) for col in table.columns
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]
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if col
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] + sorted(
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[
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rcons
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for rcons in [
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_render_constraint(cons, autogen_context)
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for cons in table.constraints
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]
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if rcons is not None
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]
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)
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if len(args) > MAX_PYTHON_ARGS:
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args = "*[" + ",\n".join(args) + "]"
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else:
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args = ",\n".join(args)
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text = "%(prefix)screate_table(%(tablename)r,\n%(args)s" % {
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"tablename": _ident(op.table_name),
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"prefix": _alembic_autogenerate_prefix(autogen_context),
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"args": args,
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}
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if op.schema:
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text += ",\nschema=%r" % _ident(op.schema)
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comment = sqla_compat._comment_attribute(table)
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if comment:
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text += ",\ncomment=%r" % _ident(comment)
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for k in sorted(op.kw):
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text += ",\n%s=%r" % (k.replace(" ", "_"), op.kw[k])
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text += "\n)"
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return text
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@renderers.dispatch_for(ops.DropTableOp)
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def _drop_table(autogen_context, op):
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text = "%(prefix)sdrop_table(%(tname)r" % {
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"prefix": _alembic_autogenerate_prefix(autogen_context),
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"tname": _ident(op.table_name),
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}
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if op.schema:
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text += ", schema=%r" % _ident(op.schema)
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text += ")"
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return text
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@renderers.dispatch_for(ops.CreateIndexOp)
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def _add_index(autogen_context, op):
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index = op.to_index()
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has_batch = autogen_context._has_batch
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if has_batch:
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tmpl = (
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"%(prefix)screate_index(%(name)r, [%(columns)s], "
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"unique=%(unique)r%(kwargs)s)"
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)
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else:
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tmpl = (
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"%(prefix)screate_index(%(name)r, %(table)r, [%(columns)s], "
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"unique=%(unique)r%(schema)s%(kwargs)s)"
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)
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text = tmpl % {
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"prefix": _alembic_autogenerate_prefix(autogen_context),
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"name": _render_gen_name(autogen_context, index.name),
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"table": _ident(index.table.name),
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"columns": ", ".join(
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_get_index_rendered_expressions(index, autogen_context)
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),
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"unique": index.unique or False,
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"schema": (", schema=%r" % _ident(index.table.schema))
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if index.table.schema
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else "",
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"kwargs": (
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", "
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+ ", ".join(
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[
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"%s=%s"
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% (key, _render_potential_expr(val, autogen_context))
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for key, val in index.kwargs.items()
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]
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)
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)
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if len(index.kwargs)
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else "",
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}
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return text
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@renderers.dispatch_for(ops.DropIndexOp)
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def _drop_index(autogen_context, op):
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has_batch = autogen_context._has_batch
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if has_batch:
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tmpl = "%(prefix)sdrop_index(%(name)r)"
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else:
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tmpl = (
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"%(prefix)sdrop_index(%(name)r, "
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"table_name=%(table_name)r%(schema)s)"
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)
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text = tmpl % {
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"prefix": _alembic_autogenerate_prefix(autogen_context),
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"name": _render_gen_name(autogen_context, op.index_name),
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"table_name": _ident(op.table_name),
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"schema": ((", schema=%r" % _ident(op.schema)) if op.schema else ""),
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}
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return text
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@renderers.dispatch_for(ops.CreateUniqueConstraintOp)
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def _add_unique_constraint(autogen_context, op):
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return [_uq_constraint(op.to_constraint(), autogen_context, True)]
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@renderers.dispatch_for(ops.CreateForeignKeyOp)
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def _add_fk_constraint(autogen_context, op):
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args = [repr(_render_gen_name(autogen_context, op.constraint_name))]
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if not autogen_context._has_batch:
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args.append(repr(_ident(op.source_table)))
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args.extend(
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[
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repr(_ident(op.referent_table)),
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repr([_ident(col) for col in op.local_cols]),
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repr([_ident(col) for col in op.remote_cols]),
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]
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)
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kwargs = [
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"referent_schema",
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"onupdate",
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"ondelete",
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"initially",
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"deferrable",
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"use_alter",
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]
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if not autogen_context._has_batch:
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kwargs.insert(0, "source_schema")
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for k in kwargs:
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if k in op.kw:
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value = op.kw[k]
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if value is not None:
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args.append("%s=%r" % (k, value))
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return "%(prefix)screate_foreign_key(%(args)s)" % {
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"prefix": _alembic_autogenerate_prefix(autogen_context),
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"args": ", ".join(args),
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}
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@renderers.dispatch_for(ops.CreatePrimaryKeyOp)
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def _add_pk_constraint(constraint, autogen_context):
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raise NotImplementedError()
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@renderers.dispatch_for(ops.CreateCheckConstraintOp)
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def _add_check_constraint(constraint, autogen_context):
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raise NotImplementedError()
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@renderers.dispatch_for(ops.DropConstraintOp)
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def _drop_constraint(autogen_context, op):
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if autogen_context._has_batch:
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template = "%(prefix)sdrop_constraint" "(%(name)r, type_=%(type)r)"
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else:
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template = (
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"%(prefix)sdrop_constraint"
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"(%(name)r, '%(table_name)s'%(schema)s, type_=%(type)r)"
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)
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text = template % {
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"prefix": _alembic_autogenerate_prefix(autogen_context),
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"name": _render_gen_name(autogen_context, op.constraint_name),
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"table_name": _ident(op.table_name),
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"type": op.constraint_type,
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"schema": (", schema=%r" % _ident(op.schema)) if op.schema else "",
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}
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return text
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@renderers.dispatch_for(ops.AddColumnOp)
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def _add_column(autogen_context, op):
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schema, tname, column = op.schema, op.table_name, op.column
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if autogen_context._has_batch:
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template = "%(prefix)sadd_column(%(column)s)"
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else:
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template = "%(prefix)sadd_column(%(tname)r, %(column)s"
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if schema:
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template += ", schema=%(schema)r"
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template += ")"
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text = template % {
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"prefix": _alembic_autogenerate_prefix(autogen_context),
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"tname": tname,
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"column": _render_column(column, autogen_context),
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"schema": schema,
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}
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return text
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@renderers.dispatch_for(ops.DropColumnOp)
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def _drop_column(autogen_context, op):
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schema, tname, column_name = op.schema, op.table_name, op.column_name
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if autogen_context._has_batch:
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template = "%(prefix)sdrop_column(%(cname)r)"
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else:
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template = "%(prefix)sdrop_column(%(tname)r, %(cname)r"
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if schema:
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template += ", schema=%(schema)r"
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template += ")"
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text = template % {
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"prefix": _alembic_autogenerate_prefix(autogen_context),
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"tname": _ident(tname),
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"cname": _ident(column_name),
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"schema": _ident(schema),
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}
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return text
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@renderers.dispatch_for(ops.AlterColumnOp)
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def _alter_column(autogen_context, op):
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tname = op.table_name
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cname = op.column_name
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server_default = op.modify_server_default
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type_ = op.modify_type
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nullable = op.modify_nullable
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comment = op.modify_comment
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autoincrement = op.kw.get("autoincrement", None)
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existing_type = op.existing_type
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existing_nullable = op.existing_nullable
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existing_comment = op.existing_comment
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existing_server_default = op.existing_server_default
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schema = op.schema
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indent = " " * 11
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if autogen_context._has_batch:
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template = "%(prefix)salter_column(%(cname)r"
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else:
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template = "%(prefix)salter_column(%(tname)r, %(cname)r"
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text = template % {
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"prefix": _alembic_autogenerate_prefix(autogen_context),
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"tname": tname,
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"cname": cname,
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}
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if existing_type is not None:
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text += ",\n%sexisting_type=%s" % (
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indent,
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_repr_type(existing_type, autogen_context),
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)
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if server_default is not False:
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rendered = _render_server_default(server_default, autogen_context)
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text += ",\n%sserver_default=%s" % (indent, rendered)
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if type_ is not None:
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text += ",\n%stype_=%s" % (indent, _repr_type(type_, autogen_context))
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if nullable is not None:
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text += ",\n%snullable=%r" % (indent, nullable)
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if comment is not False:
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text += ",\n%scomment=%r" % (indent, comment)
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if existing_comment is not None:
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text += ",\n%sexisting_comment=%r" % (indent, existing_comment)
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if nullable is None and existing_nullable is not None:
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text += ",\n%sexisting_nullable=%r" % (indent, existing_nullable)
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if autoincrement is not None:
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text += ",\n%sautoincrement=%r" % (indent, autoincrement)
|
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if server_default is False and existing_server_default:
|
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rendered = _render_server_default(
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existing_server_default, autogen_context
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)
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text += ",\n%sexisting_server_default=%s" % (indent, rendered)
|
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if schema and not autogen_context._has_batch:
|
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text += ",\n%sschema=%r" % (indent, schema)
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text += ")"
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return text
|
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|
|
|
|
class _f_name(object):
|
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def __init__(self, prefix, name):
|
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self.prefix = prefix
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self.name = name
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|
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def __repr__(self):
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return "%sf(%r)" % (self.prefix, _ident(self.name))
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|
|
|
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def _ident(name):
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"""produce a __repr__() object for a string identifier that may
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use quoted_name() in SQLAlchemy 0.9 and greater.
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The issue worked around here is that quoted_name() doesn't have
|
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very good repr() behavior by itself when unicode is involved.
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"""
|
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if name is None:
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return name
|
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elif isinstance(name, sql.elements.quoted_name):
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if compat.py2k:
|
|
# the attempt to encode to ascii here isn't super ideal,
|
|
# however we are trying to cut down on an explosion of
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# u'' literals only when py2k + SQLA 0.9, in particular
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# makes unit tests testing code generation very difficult
|
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try:
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return name.encode("ascii")
|
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except UnicodeError:
|
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return compat.text_type(name)
|
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else:
|
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return compat.text_type(name)
|
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elif isinstance(name, compat.string_types):
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return name
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|
|
|
|
def _render_potential_expr(
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value, autogen_context, wrap_in_text=True, is_server_default=False
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):
|
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if isinstance(value, sql.ClauseElement):
|
|
|
|
if wrap_in_text:
|
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template = "%(prefix)stext(%(sql)r)"
|
|
else:
|
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template = "%(sql)r"
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|
|
return template % {
|
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"prefix": _sqlalchemy_autogenerate_prefix(autogen_context),
|
|
"sql": autogen_context.migration_context.impl.render_ddl_sql_expr(
|
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value, is_server_default=is_server_default
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),
|
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}
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|
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else:
|
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return repr(value)
|
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|
|
|
|
def _get_index_rendered_expressions(idx, autogen_context):
|
|
return [
|
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repr(_ident(getattr(exp, "name", None)))
|
|
if isinstance(exp, sa_schema.Column)
|
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else _render_potential_expr(exp, autogen_context)
|
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for exp in idx.expressions
|
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]
|
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|
|
|
|
def _uq_constraint(constraint, autogen_context, alter):
|
|
opts = []
|
|
|
|
has_batch = autogen_context._has_batch
|
|
|
|
if constraint.deferrable:
|
|
opts.append(("deferrable", str(constraint.deferrable)))
|
|
if constraint.initially:
|
|
opts.append(("initially", str(constraint.initially)))
|
|
if not has_batch and alter and constraint.table.schema:
|
|
opts.append(("schema", _ident(constraint.table.schema)))
|
|
if not alter and constraint.name:
|
|
opts.append(
|
|
("name", _render_gen_name(autogen_context, constraint.name))
|
|
)
|
|
|
|
if alter:
|
|
args = [repr(_render_gen_name(autogen_context, constraint.name))]
|
|
if not has_batch:
|
|
args += [repr(_ident(constraint.table.name))]
|
|
args.append(repr([_ident(col.name) for col in constraint.columns]))
|
|
args.extend(["%s=%r" % (k, v) for k, v in opts])
|
|
return "%(prefix)screate_unique_constraint(%(args)s)" % {
|
|
"prefix": _alembic_autogenerate_prefix(autogen_context),
|
|
"args": ", ".join(args),
|
|
}
|
|
else:
|
|
args = [repr(_ident(col.name)) for col in constraint.columns]
|
|
args.extend(["%s=%r" % (k, v) for k, v in opts])
|
|
return "%(prefix)sUniqueConstraint(%(args)s)" % {
|
|
"prefix": _sqlalchemy_autogenerate_prefix(autogen_context),
|
|
"args": ", ".join(args),
|
|
}
|
|
|
|
|
|
def _user_autogenerate_prefix(autogen_context, target):
|
|
prefix = autogen_context.opts["user_module_prefix"]
|
|
if prefix is None:
|
|
return "%s." % target.__module__
|
|
else:
|
|
return prefix
|
|
|
|
|
|
def _sqlalchemy_autogenerate_prefix(autogen_context):
|
|
return autogen_context.opts["sqlalchemy_module_prefix"] or ""
|
|
|
|
|
|
def _alembic_autogenerate_prefix(autogen_context):
|
|
if autogen_context._has_batch:
|
|
return "batch_op."
|
|
else:
|
|
return autogen_context.opts["alembic_module_prefix"] or ""
|
|
|
|
|
|
def _user_defined_render(type_, object_, autogen_context):
|
|
if "render_item" in autogen_context.opts:
|
|
render = autogen_context.opts["render_item"]
|
|
if render:
|
|
rendered = render(type_, object_, autogen_context)
|
|
if rendered is not False:
|
|
return rendered
|
|
return False
|
|
|
|
|
|
def _render_column(column, autogen_context):
|
|
rendered = _user_defined_render("column", column, autogen_context)
|
|
if rendered is not False:
|
|
return rendered
|
|
|
|
args = []
|
|
opts = []
|
|
|
|
if column.server_default:
|
|
if sqla_compat._server_default_is_computed(column):
|
|
rendered = _render_computed(column.computed, autogen_context)
|
|
if rendered:
|
|
args.append(rendered)
|
|
else:
|
|
rendered = _render_server_default(
|
|
column.server_default, autogen_context
|
|
)
|
|
if rendered:
|
|
opts.append(("server_default", rendered))
|
|
|
|
if (
|
|
column.autoincrement is not None
|
|
and column.autoincrement != sqla_compat.AUTOINCREMENT_DEFAULT
|
|
):
|
|
opts.append(("autoincrement", column.autoincrement))
|
|
|
|
if column.nullable is not None:
|
|
opts.append(("nullable", column.nullable))
|
|
|
|
if column.system:
|
|
opts.append(("system", column.system))
|
|
|
|
comment = sqla_compat._comment_attribute(column)
|
|
if comment:
|
|
opts.append(("comment", "%r" % comment))
|
|
|
|
# TODO: for non-ascii colname, assign a "key"
|
|
return "%(prefix)sColumn(%(name)r, %(type)s, %(args)s%(kwargs)s)" % {
|
|
"prefix": _sqlalchemy_autogenerate_prefix(autogen_context),
|
|
"name": _ident(column.name),
|
|
"type": _repr_type(column.type, autogen_context),
|
|
"args": ", ".join([str(arg) for arg in args]) + ", " if args else "",
|
|
"kwargs": (
|
|
", ".join(
|
|
["%s=%s" % (kwname, val) for kwname, val in opts]
|
|
+ [
|
|
"%s=%s"
|
|
% (key, _render_potential_expr(val, autogen_context))
|
|
for key, val in sqla_compat._column_kwargs(column).items()
|
|
]
|
|
)
|
|
),
|
|
}
|
|
|
|
|
|
def _render_server_default(default, autogen_context, repr_=True):
|
|
rendered = _user_defined_render("server_default", default, autogen_context)
|
|
if rendered is not False:
|
|
return rendered
|
|
|
|
if sqla_compat.has_computed and isinstance(default, sa_schema.Computed):
|
|
return _render_computed(default, autogen_context)
|
|
elif isinstance(default, sa_schema.DefaultClause):
|
|
if isinstance(default.arg, compat.string_types):
|
|
default = default.arg
|
|
else:
|
|
return _render_potential_expr(
|
|
default.arg, autogen_context, is_server_default=True
|
|
)
|
|
|
|
if isinstance(default, string_types) and repr_:
|
|
default = repr(re.sub(r"^'|'$", "", default))
|
|
|
|
return default
|
|
|
|
|
|
def _render_computed(computed, autogen_context):
|
|
text = _render_potential_expr(
|
|
computed.sqltext, autogen_context, wrap_in_text=False
|
|
)
|
|
|
|
kwargs = {}
|
|
if computed.persisted is not None:
|
|
kwargs["persisted"] = computed.persisted
|
|
return "%(prefix)sComputed(%(text)s, %(kwargs)s)" % {
|
|
"prefix": _sqlalchemy_autogenerate_prefix(autogen_context),
|
|
"text": text,
|
|
"kwargs": (", ".join("%s=%s" % pair for pair in kwargs.items())),
|
|
}
|
|
|
|
|
|
def _repr_type(type_, autogen_context):
|
|
rendered = _user_defined_render("type", type_, autogen_context)
|
|
if rendered is not False:
|
|
return rendered
|
|
|
|
if hasattr(autogen_context.migration_context, "impl"):
|
|
impl_rt = autogen_context.migration_context.impl.render_type(
|
|
type_, autogen_context
|
|
)
|
|
else:
|
|
impl_rt = None
|
|
|
|
mod = type(type_).__module__
|
|
imports = autogen_context.imports
|
|
if mod.startswith("sqlalchemy.dialects"):
|
|
dname = re.match(r"sqlalchemy\.dialects\.(\w+)", mod).group(1)
|
|
if imports is not None:
|
|
imports.add("from sqlalchemy.dialects import %s" % dname)
|
|
if impl_rt:
|
|
return impl_rt
|
|
else:
|
|
return "%s.%r" % (dname, type_)
|
|
elif impl_rt:
|
|
return impl_rt
|
|
elif mod.startswith("sqlalchemy."):
|
|
if type(type_) is sqltypes.Variant:
|
|
return _render_Variant_type(type_, autogen_context)
|
|
if "_render_%s_type" % type_.__visit_name__ in globals():
|
|
fn = globals()["_render_%s_type" % type_.__visit_name__]
|
|
return fn(type_, autogen_context)
|
|
else:
|
|
prefix = _sqlalchemy_autogenerate_prefix(autogen_context)
|
|
return "%s%r" % (prefix, type_)
|
|
else:
|
|
prefix = _user_autogenerate_prefix(autogen_context, type_)
|
|
return "%s%r" % (prefix, type_)
|
|
|
|
|
|
def _render_ARRAY_type(type_, autogen_context):
|
|
return _render_type_w_subtype(
|
|
type_, autogen_context, "item_type", r"(.+?\()"
|
|
)
|
|
|
|
|
|
def _render_Variant_type(type_, autogen_context):
|
|
base = _repr_type(type_.impl, autogen_context)
|
|
for dialect in sorted(type_.mapping):
|
|
typ = type_.mapping[dialect]
|
|
base += ".with_variant(%s, %r)" % (
|
|
_repr_type(typ, autogen_context),
|
|
dialect,
|
|
)
|
|
return base
|
|
|
|
|
|
def _render_type_w_subtype(
|
|
type_, autogen_context, attrname, regexp, prefix=None
|
|
):
|
|
outer_repr = repr(type_)
|
|
inner_type = getattr(type_, attrname, None)
|
|
if inner_type is None:
|
|
return False
|
|
|
|
inner_repr = repr(inner_type)
|
|
|
|
inner_repr = re.sub(r"([\(\)])", r"\\\1", inner_repr)
|
|
sub_type = _repr_type(getattr(type_, attrname), autogen_context)
|
|
outer_type = re.sub(regexp + inner_repr, r"\1%s" % sub_type, outer_repr)
|
|
|
|
if prefix:
|
|
return "%s%s" % (prefix, outer_type)
|
|
|
|
mod = type(type_).__module__
|
|
if mod.startswith("sqlalchemy.dialects"):
|
|
dname = re.match(r"sqlalchemy\.dialects\.(\w+)", mod).group(1)
|
|
return "%s.%s" % (dname, outer_type)
|
|
elif mod.startswith("sqlalchemy"):
|
|
prefix = _sqlalchemy_autogenerate_prefix(autogen_context)
|
|
return "%s%s" % (prefix, outer_type)
|
|
else:
|
|
return None
|
|
|
|
|
|
_constraint_renderers = util.Dispatcher()
|
|
|
|
|
|
def _render_constraint(constraint, autogen_context):
|
|
try:
|
|
renderer = _constraint_renderers.dispatch(constraint)
|
|
except ValueError:
|
|
util.warn("No renderer is established for object %r" % constraint)
|
|
return "[Unknown Python object %r]" % constraint
|
|
else:
|
|
return renderer(constraint, autogen_context)
|
|
|
|
|
|
@_constraint_renderers.dispatch_for(sa_schema.PrimaryKeyConstraint)
|
|
def _render_primary_key(constraint, autogen_context):
|
|
rendered = _user_defined_render("primary_key", constraint, autogen_context)
|
|
if rendered is not False:
|
|
return rendered
|
|
|
|
if not constraint.columns:
|
|
return None
|
|
|
|
opts = []
|
|
if constraint.name:
|
|
opts.append(
|
|
("name", repr(_render_gen_name(autogen_context, constraint.name)))
|
|
)
|
|
return "%(prefix)sPrimaryKeyConstraint(%(args)s)" % {
|
|
"prefix": _sqlalchemy_autogenerate_prefix(autogen_context),
|
|
"args": ", ".join(
|
|
[repr(c.name) for c in constraint.columns]
|
|
+ ["%s=%s" % (kwname, val) for kwname, val in opts]
|
|
),
|
|
}
|
|
|
|
|
|
def _fk_colspec(fk, metadata_schema):
|
|
"""Implement a 'safe' version of ForeignKey._get_colspec() that
|
|
won't fail if the remote table can't be resolved.
|
|
|
|
"""
|
|
colspec = fk._get_colspec()
|
|
tokens = colspec.split(".")
|
|
tname, colname = tokens[-2:]
|
|
|
|
if metadata_schema is not None and len(tokens) == 2:
|
|
table_fullname = "%s.%s" % (metadata_schema, tname)
|
|
else:
|
|
table_fullname = ".".join(tokens[0:-1])
|
|
|
|
if (
|
|
not fk.link_to_name
|
|
and fk.parent is not None
|
|
and fk.parent.table is not None
|
|
):
|
|
# try to resolve the remote table in order to adjust for column.key.
|
|
# the FK constraint needs to be rendered in terms of the column
|
|
# name.
|
|
parent_metadata = fk.parent.table.metadata
|
|
if table_fullname in parent_metadata.tables:
|
|
col = parent_metadata.tables[table_fullname].c.get(colname)
|
|
if col is not None:
|
|
colname = _ident(col.name)
|
|
|
|
colspec = "%s.%s" % (table_fullname, colname)
|
|
|
|
return colspec
|
|
|
|
|
|
def _populate_render_fk_opts(constraint, opts):
|
|
|
|
if constraint.onupdate:
|
|
opts.append(("onupdate", repr(constraint.onupdate)))
|
|
if constraint.ondelete:
|
|
opts.append(("ondelete", repr(constraint.ondelete)))
|
|
if constraint.initially:
|
|
opts.append(("initially", repr(constraint.initially)))
|
|
if constraint.deferrable:
|
|
opts.append(("deferrable", repr(constraint.deferrable)))
|
|
if constraint.use_alter:
|
|
opts.append(("use_alter", repr(constraint.use_alter)))
|
|
|
|
|
|
@_constraint_renderers.dispatch_for(sa_schema.ForeignKeyConstraint)
|
|
def _render_foreign_key(constraint, autogen_context):
|
|
rendered = _user_defined_render("foreign_key", constraint, autogen_context)
|
|
if rendered is not False:
|
|
return rendered
|
|
|
|
opts = []
|
|
if constraint.name:
|
|
opts.append(
|
|
("name", repr(_render_gen_name(autogen_context, constraint.name)))
|
|
)
|
|
|
|
_populate_render_fk_opts(constraint, opts)
|
|
|
|
apply_metadata_schema = constraint.parent.metadata.schema
|
|
return (
|
|
"%(prefix)sForeignKeyConstraint([%(cols)s], "
|
|
"[%(refcols)s], %(args)s)"
|
|
% {
|
|
"prefix": _sqlalchemy_autogenerate_prefix(autogen_context),
|
|
"cols": ", ".join(
|
|
"%r" % _ident(f.parent.name) for f in constraint.elements
|
|
),
|
|
"refcols": ", ".join(
|
|
repr(_fk_colspec(f, apply_metadata_schema))
|
|
for f in constraint.elements
|
|
),
|
|
"args": ", ".join(
|
|
["%s=%s" % (kwname, val) for kwname, val in opts]
|
|
),
|
|
}
|
|
)
|
|
|
|
|
|
@_constraint_renderers.dispatch_for(sa_schema.UniqueConstraint)
|
|
def _render_unique_constraint(constraint, autogen_context):
|
|
rendered = _user_defined_render("unique", constraint, autogen_context)
|
|
if rendered is not False:
|
|
return rendered
|
|
|
|
return _uq_constraint(constraint, autogen_context, False)
|
|
|
|
|
|
@_constraint_renderers.dispatch_for(sa_schema.CheckConstraint)
|
|
def _render_check_constraint(constraint, autogen_context):
|
|
rendered = _user_defined_render("check", constraint, autogen_context)
|
|
if rendered is not False:
|
|
return rendered
|
|
|
|
# detect the constraint being part of
|
|
# a parent type which is probably in the Table already.
|
|
# ideally SQLAlchemy would give us more of a first class
|
|
# way to detect this.
|
|
if (
|
|
constraint._create_rule
|
|
and hasattr(constraint._create_rule, "target")
|
|
and isinstance(constraint._create_rule.target, sqltypes.TypeEngine)
|
|
):
|
|
return None
|
|
opts = []
|
|
if constraint.name:
|
|
opts.append(
|
|
("name", repr(_render_gen_name(autogen_context, constraint.name)))
|
|
)
|
|
return "%(prefix)sCheckConstraint(%(sqltext)s%(opts)s)" % {
|
|
"prefix": _sqlalchemy_autogenerate_prefix(autogen_context),
|
|
"opts": ", " + (", ".join("%s=%s" % (k, v) for k, v in opts))
|
|
if opts
|
|
else "",
|
|
"sqltext": _render_potential_expr(
|
|
constraint.sqltext, autogen_context, wrap_in_text=False
|
|
),
|
|
}
|
|
|
|
|
|
@renderers.dispatch_for(ops.ExecuteSQLOp)
|
|
def _execute_sql(autogen_context, op):
|
|
if not isinstance(op.sqltext, string_types):
|
|
raise NotImplementedError(
|
|
"Autogenerate rendering of SQL Expression language constructs "
|
|
"not supported here; please use a plain SQL string"
|
|
)
|
|
return "op.execute(%r)" % op.sqltext
|
|
|
|
|
|
renderers = default_renderers.branch()
|